#include<bits/stdc++.h>
using namespace std;
#define int long long
int sz[500001], ans[500001];
signed main() {

	string s;
	cin >> s;
	reverse(s.begin(), s.end());
	for (int i = s.length() - 1; i >= 0; i--) {
		sz[i] = sz[i + 1] + (s[i] - '0');
	}

	for (int i = 0; i <= 500001; i++) {
		sz[i + 1] += sz[i] / 10;
		sz[i] %= 10;
	}
	int f = 500001;
	while (sz[f] == 0)f--;
	while (f >= 0) {
		cout << sz[f];
		f--;
	}

}